Has anyone ever seen a direct crank (like on a kids trike) internally geared setup? Might it be possible to convert an old three speed hub to such a setup with a bit of fabrication?
What you call "direct crank" is more commonly known as "fixed gear."
See:
http://sheldonbrown.com/asc
and:
http://sheldonbrown.com/gunnar
Sheldon "
http://sheldonbrown.com/fixed " Brown